Invention Grant
US08794057B2 Diagnostic operation strategy for diesel oxidation catalyst aging level determination using NOx sensor NO2 interference
有权
柴油氧化催化剂老化水平测定使用NOx传感器NO2干扰的诊断操作策略
- Patent Title: Diagnostic operation strategy for diesel oxidation catalyst aging level determination using NOx sensor NO2 interference
- Patent Title (中): 柴油氧化催化剂老化水平测定使用NOx传感器NO2干扰的诊断操作策略
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Application No.: US13688342Application Date: 2012-11-29
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Publication No.: US08794057B2Publication Date: 2014-08-05
- Inventor: Raffaello Ardanese , Vincent J. Tylutki , James M Perrin , Justin A Shetney
- Applicant: GM Global Technology Operations LLC
- Applicant Address: US MI Detroit
- Assignee: GM Global Technology Operations LLC
- Current Assignee: GM Global Technology Operations LLC
- Current Assignee Address: US MI Detroit
- Agency: Quinn Law Group, PLLC
- Main IPC: G01M15/10
- IPC: G01M15/10 ; F01N11/00
Abstract:
A method of determining aging of a diesel oxidation catalyst (DOC) in an engine exhaust system includes receiving a first sensor signal from a first nitrogen oxides (NOx) sensor positioned in exhaust flow upstream of the DOC. The first sensor signal is indicative of an amount of NOx in the exhaust flow upstream of the DOC. The method further includes receiving a second sensor signal from a second NOx sensor positioned in the exhaust flow downstream of the DOC. The second sensor signal is indicative of an amount of NOx downstream of the DOC. A difference between the first sensor signal and the second sensor signal is calculated by a controller. A DOC aging level based on a predetermined correlation between the difference and DOC aging can then be determined by the controller if at least one predetermined operating condition is satisfied.
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